1. What are the independent and dependent variables in each of the experiments?

Answer:

Cohesion

Explanation:

Cohesion is the force responsible for holding the molecules of water together.

Adhesion is type of force between two different molecules or compounds.

Surface tension allows water molecules or molecules to resist any external force "due" to cohesive forces.

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Balanced forces do not change the motion of an object, Because the forces are the same size and acting in opposite directions.

Answer:

Balanced forces do not change the motion of an object. The motion of an object will not change if the forces pushing or pulling the object are balanced. An object that is sitting still will stay still if the forces acting on it are balanced.

We have that the normal force is given as [tex]F_N=4802N[/tex],while the minimum amount of force needed to get the piano to move to be [tex]F_f=1680.7N[/tex] and

Coefficient of kinetic friction as [tex]\mu_k=0.23[/tex]

A)  [tex]F_N=4802N[/tex]

B) [tex]F_f=1680.7N[/tex]

C)  [tex]\mu_k=0.23[/tex]

From the question we are told that:

Mass [tex]m=490kg[/tex]

A)

Generally, the equation for normal force  is mathematically given by

[tex]F_N=mg[/tex]

[tex]F_N=(490kg*9.81)[/tex]

[tex]F_N=4802N[/tex]

B)

From the question we are told that:

Coefficient of static friction [tex]\mu=0.35[/tex]

Generally, the equation for Frictional Force  is mathematically given by

[tex]F_f=\mu mg\\\\F_f=4802*0.35[/tex]

[tex]F_f=1680.7N[/tex]

C)

From the question we are told that:

Horizontal force [tex]F_h =1.1 * 10^2 N[/tex]

Generally, the equation for coefficient of kinetic friction  is mathematically given by

[tex]\mu_k=\frac{F_h}{mg}[/tex]

[tex]\mu_k=\frac{1.1 x 10^2}{4802}[/tex]

[tex]\mu_k=0.23[/tex]

Therefore in conclusion

the normal force is given as [tex]F_N=4802N[/tex],while the minimum amount of force needed to get the piano to move to be [tex]F_f=1680.7N[/tex] and

Coefficient of kinetic friction as [tex]\mu_k=0.23[/tex]

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Answer:

It took 2 hours

Explanation:

[tex]{ \bf{time = \frac{distance}{speed} }} \\ [/tex]

distance is 90 miles

speed is 45 miles per hour

[tex]t = \frac{90}{45} \\ \\ t = 2 \: h[/tex]

Answer:

2 hours

Explanation:

45 times 2 is 90

The Answer should most likely be A

Explanation:

you see B and C are pretty much the same but A has more weight and more wheels (sorry been a while sense I did this so I am calling the wheel and axel points what they look like to me) with having more wheels and axels and more weight it should have a higher force advantage.

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Answer:

1 casparian strips are present in the root of endodermis.

2 the endarch condition is the character fature of stem.

Answer:

Valence electrons increase by one

The 'Periodic Table' is characterized as the 'tabular representation of chemical elements as per their atomic number in order to keep the elements possessing similar properties in a single group.'

In case one moves towards right from left in this table except for the transition elements, the trend that occurs would be:

A). Valence electrons increase by one.

Thus, option A is the correct answer.

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Answer:

your answer is (B) decreasing

I hope it's helps you

Explanation:

Move past each other.

Have a good day.

Answer:

the long wavelength and not focused on the negatives.

Answer:

a. [tex]a=1.875\,ms^{-2}[/tex]

b. [tex]v_{0} =7.5\,ms^{-1}[/tex]

c. [tex]s=60\,m[/tex]

Explanation:

Given,

[tex]u=0\,ms^{-1}\,;[starts\,from\,rest]\\v=15\,ms^{-1}\\t=8\,s[/tex]

a. We know,

∴[tex]v=u+at\\=>15=0+a*8\\a=1.875\,ms^{-2}[/tex]

b. We know,

∴[tex]s=\frac{u+v}{2}*t\\=>s=\frac{0+15}{2}*8\\s=60\,m[/tex]

average velocity,[tex]v_{0} =\frac{s}{t}=\frac{60}{8}=7.5\,ms^{-1}[/tex]

c. From b, the answer is 60 m

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Answer:

inertia is due to friction

Answer:

The quantity which can be measured is called physical quantity.

Answer:

Those quantities which can be measured are called physical quantities.

Answer:

F = G M1 M2 / R^2

R^2 = G M1 M2 / F

R^2 = 6.67 E-11 * 6.78 E26 * 5.42 E20 / 8.6 E10

R^2 = 6.67 * 6.78 * 5.42 / 8.6 * E25

R^2 = 28.5 * E25 = 2.85 * E26

R = 1.69 E13 m

Answer:

m2·kg·s-2

Explanation:

this is the answ

Answer:

dude if any body could answer that they deserve a Nobel prize because the formula to solve that would require the exact measurement of hadar or as commonly known beta centauri

Explanation:

Answer:

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6

53

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5

6546

3

4

5

6

6

53

3

4

6

65

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The four variables that must be controlled for the results of Maria and Elena to be valid are

Variables in an experiment are those values that can change.

When conducting an experiment, there are usually different types of variables that are used and one of such is the Controlled variables.

The Controlled variables are known as those extraneous variables that can affect the results ( dependent variables) of an experiment. Therefore they should be held constant in order to obtain a valid result.

Examples of such controlled variables are Temperature, Amount of light,

Humidity and Time.

Take for instance, If the experiment conducted by Maria and Elena has to do with the rate at which an enzyme acts on different substrates. The temperature of the experiment needs to be constantly maintained to achieve a valid result.

This is because an increased temperature leads to increased rate of reaction between the enzyme and the substrate.

Therefore the variables that must be controlled for Maria and Elena results to be valid are the controlled variables which includes Temperature, Amount of light, Humidity, Time.

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Answer:

Marie Curie

Explanation:

I hope to see you helped :D?

An irreversible reaction is a reaction that tends to completion. When a strong acid added to water, the reaction is irreversible.

In chemistry, a reaction may be reversible or irreversible. In a reversible reaction, the reaction could move forward or backwards. An irreversible reaction only tends towards completion. It doesn't goes in the reverse direction.

When a weak acid or base is added to water, the reaction is reversible because the substance does not ionize to a large extent in water and the equilibrium position may lie towards the far left. However, a strong acid or base achieves 100% ionization in water hence the reaction is irreversible.

Therefore, when a strong acid added to water, the reaction is irreversible.

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Answer:

1. strong acid added to water

2. The dissociation constant for hydrochloric acid is greater than the dissociation constant for acetic acid.

3. HA, HC, HB

4. decreasing the concentration of OH– ions

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There are several models that outlines the scientific method, which is

based on formulating an hypothesis to answer observed phenomena, and

testing the hypothesis to see if it is correct

The correct option for the explanation for the step between experimenting and conclusion is option D

(D) The need to evaluate the meaning of the experiment's results before

drawing a conclusion

The steps in the scientific method are designed to help solve existing

problems and they include;

The step that comes between experimenting and conclusion is the

analysis of the experimental result to extract the information from the raw

experimental data, so as to evaluate the hypothesis and also the

procedure of the experiment. After the analysis, conclusion is drawn and

reported followed a new hypothesis is formulated or the existing

hypothesis is expanded upon, Therefore, the correct option is option D.

The need to evaluate the meaning of the experiment's results before

drawing a conclusion

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Explanation:

Explanation:

Pressure is defined as a Force over an

Area.

p=F/A

We can rearrange this to make the Force

the subject

F = p *A

The pressure is given as 1200 Pa.

We know a pascal is 1 Newton / Square

metre = N/m²

The area of a cube will be width * breadth

= 1.5 m * 1.5 m= 2.25 m²

So the force the cube is pushing down

with (its weight) is simply

F = p * A = 1200 N/m² * 2.25 m² = 2700 N

Weight is officialy defined as a force

measured in Newtons, but when we

talk about weight we often give it in

Kilograms (a unit of mass).

To get the weight in units of

Kilogram-force you must divide by the

gravitational acceleration =9.81 m/s²

2700 / 9.81 = 275.23 Kg

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We have that with these disciplines well defined, The Form of accounting that speaks the most Burger Huts situation is the discipline of Management Accounting

Firstly we define the Disciplines of Accounting below

Financial accounting

Financial Accounting, this is a branch of accounting that focuses mainly on the Recording,Encapsulating or Summing up and then Releasing a statement bearing the Affairs of a Business over a specific time frame.

Management Accounting

This Branch of accounting focuses on the use of existing Financial positions to make assessment of a business and determine the best way to move the business forward.

Tax Accounting

This is a branch of accounting that focuses on taxation.This branch is governed by stiff rule that ensure that business stay in check.

Therefore

With these disciplines well defined, The Form of accounting that speaks the most Burger Huts situation is the discipline of Management Accounting

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The periodic table is an arrangement of elements into groups and periods based on their periodic properties. Elements a placed in these groups and periods.

1) A negatively charged ion is chloride

2) Moving from left to right, valence electrons increase by one.

3) The period number gives information about how many energy levels it has

4) Fluorine has a charge of 1–

5) Potassium and iodine form an ionic bond.

In the periodic table, elements are arranged in groups and periods. There are 18 groups and 8 periods.

Chlorine is in group 17, there have seven outermost electrons hence the chlorine atom needs only one more electron in order to attain a stable octet. This is done by accepting one electron to form the negatively charged chloride ion.

As we move from one period to another, one extra electron is added to the outermost shell of elements. Hence, the valence electrons increases by one.

The period to which an element belongs shows you the number of shells or energy levels in the atom of that element.

Fluorine is in group 17. One electron is needed to achieve a stable octet. When an atom accepts one electron, its charge is 1–.

Bonding based on ionic charges occurs between metals and nonmetals. Potassium is a metal of group 1 and iodine is a non metal of group 17 hence they can bond together based on their ionic charges.

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Answer:

i hope it helped U

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Explanation:

a) Distance ➤ (80+50+70+40) m. ➤ Distance= 240m.

b) Displacement ➤ (50+40)m. ➤ Displacement= 90m

c) Average Speed ➤ Total distance travelled/total time taken

                              ➤ 240/48

                              ➤ 5 [tex]ms^{-1}[/tex]

d) Average Velocity ➤ Total displacement/total time taken

                                 ➤ 90/48

                                 ➤ 1.875 [tex]ms^{-1}[/tex]

Answer:

the answer is a. a ball is moving towards the camera faster then slower